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Let their present age be 8x and 5x respectively. Product of their ages = 40x² = 4000 => x² = 100 => x = 10 Present age of A = 8x = 80 years Present age of B = 5x = 50 years Ratio of their ages after 5 years = (80+5) : (50+5) = 85:55 = 17:11
Which of the following is a physical change?
The pH of a neutral solution is —
The gas used for filling weather balloons is-
The major constituent of air is
Milk tastes sour when kept in the open for sometimes due to the formation of-
The noble gas used in radiotherapy is
______is the process in which acids and bases react to form salts and water
The acid used in lead storage cells is-
The pH of a neutral solution is —
Formation of ozone hole is maximum over